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<pre class="sourceHeading">            Line data    Source code</pre>
<pre class="source">
<span id="L1"><span class="lineNum">       1</span>              : // Streambuf iterators</span>
<span id="L2"><span class="lineNum">       2</span>              : </span>
<span id="L3"><span class="lineNum">       3</span>              : // Copyright (C) 1997-2023 Free Software Foundation, Inc.</span>
<span id="L4"><span class="lineNum">       4</span>              : //</span>
<span id="L5"><span class="lineNum">       5</span>              : // This file is part of the GNU ISO C++ Library.  This library is free</span>
<span id="L6"><span class="lineNum">       6</span>              : // software; you can redistribute it and/or modify it under the</span>
<span id="L7"><span class="lineNum">       7</span>              : // terms of the GNU General Public License as published by the</span>
<span id="L8"><span class="lineNum">       8</span>              : // Free Software Foundation; either version 3, or (at your option)</span>
<span id="L9"><span class="lineNum">       9</span>              : // any later version.</span>
<span id="L10"><span class="lineNum">      10</span>              : </span>
<span id="L11"><span class="lineNum">      11</span>              : // This library is distributed in the hope that it will be useful,</span>
<span id="L12"><span class="lineNum">      12</span>              : // but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span id="L13"><span class="lineNum">      13</span>              : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span id="L14"><span class="lineNum">      14</span>              : // GNU General Public License for more details.</span>
<span id="L15"><span class="lineNum">      15</span>              : </span>
<span id="L16"><span class="lineNum">      16</span>              : // Under Section 7 of GPL version 3, you are granted additional</span>
<span id="L17"><span class="lineNum">      17</span>              : // permissions described in the GCC Runtime Library Exception, version</span>
<span id="L18"><span class="lineNum">      18</span>              : // 3.1, as published by the Free Software Foundation.</span>
<span id="L19"><span class="lineNum">      19</span>              : </span>
<span id="L20"><span class="lineNum">      20</span>              : // You should have received a copy of the GNU General Public License and</span>
<span id="L21"><span class="lineNum">      21</span>              : // a copy of the GCC Runtime Library Exception along with this program;</span>
<span id="L22"><span class="lineNum">      22</span>              : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see</span>
<span id="L23"><span class="lineNum">      23</span>              : // &lt;http://www.gnu.org/licenses/&gt;.</span>
<span id="L24"><span class="lineNum">      24</span>              : </span>
<span id="L25"><span class="lineNum">      25</span>              : /** @file bits/streambuf_iterator.h</span>
<span id="L26"><span class="lineNum">      26</span>              :  *  This is an internal header file, included by other library headers.</span>
<span id="L27"><span class="lineNum">      27</span>              :  *  Do not attempt to use it directly. @headername{iterator}</span>
<span id="L28"><span class="lineNum">      28</span>              :  */</span>
<span id="L29"><span class="lineNum">      29</span>              : </span>
<span id="L30"><span class="lineNum">      30</span>              : #ifndef _STREAMBUF_ITERATOR_H</span>
<span id="L31"><span class="lineNum">      31</span>              : #define _STREAMBUF_ITERATOR_H 1</span>
<span id="L32"><span class="lineNum">      32</span>              : </span>
<span id="L33"><span class="lineNum">      33</span>              : #pragma GCC system_header</span>
<span id="L34"><span class="lineNum">      34</span>              : </span>
<span id="L35"><span class="lineNum">      35</span>              : #include &lt;streambuf&gt;</span>
<span id="L36"><span class="lineNum">      36</span>              : #include &lt;bits/stl_iterator_base_types.h&gt;</span>
<span id="L37"><span class="lineNum">      37</span>              : #include &lt;debug/debug.h&gt;</span>
<span id="L38"><span class="lineNum">      38</span>              : </span>
<span id="L39"><span class="lineNum">      39</span>              : namespace std _GLIBCXX_VISIBILITY(default)</span>
<span id="L40"><span class="lineNum">      40</span>              : {</span>
<span id="L41"><span class="lineNum">      41</span>              : _GLIBCXX_BEGIN_NAMESPACE_VERSION</span>
<span id="L42"><span class="lineNum">      42</span>              : </span>
<span id="L43"><span class="lineNum">      43</span>              :   /**</span>
<span id="L44"><span class="lineNum">      44</span>              :    * @addtogroup iterators</span>
<span id="L45"><span class="lineNum">      45</span>              :    * @{</span>
<span id="L46"><span class="lineNum">      46</span>              :    */</span>
<span id="L47"><span class="lineNum">      47</span>              : </span>
<span id="L48"><span class="lineNum">      48</span>              : // Ignore warnings about std::iterator.</span>
<span id="L49"><span class="lineNum">      49</span>              : #pragma GCC diagnostic push</span>
<span id="L50"><span class="lineNum">      50</span>              : #pragma GCC diagnostic ignored &quot;-Wdeprecated-declarations&quot;</span>
<span id="L51"><span class="lineNum">      51</span>              :   // 24.5.3 Template class istreambuf_iterator</span>
<span id="L52"><span class="lineNum">      52</span>              :   /// Provides input iterator semantics for streambufs.</span>
<span id="L53"><span class="lineNum">      53</span>              :   template&lt;typename _CharT, typename _Traits&gt;</span>
<span id="L54"><span class="lineNum">      54</span>              :     class istreambuf_iterator</span>
<span id="L55"><span class="lineNum">      55</span>              :     : public iterator&lt;input_iterator_tag, _CharT, typename _Traits::off_type,</span>
<span id="L56"><span class="lineNum">      56</span>              :                       _CharT*, _CharT&gt;</span>
<span id="L57"><span class="lineNum">      57</span>              :     {</span>
<span id="L58"><span class="lineNum">      58</span>              :     public:</span>
<span id="L59"><span class="lineNum">      59</span>              :       // Types:</span>
<span id="L60"><span class="lineNum">      60</span>              :       ///@{</span>
<span id="L61"><span class="lineNum">      61</span>              :       /// Public typedefs</span>
<span id="L62"><span class="lineNum">      62</span>              : #if __cplusplus &lt; 201103L</span>
<span id="L63"><span class="lineNum">      63</span>              :       typedef _CharT&amp; reference; // Changed to _CharT by LWG 445</span>
<span id="L64"><span class="lineNum">      64</span>              : #elif __cplusplus &gt; 201703L</span>
<span id="L65"><span class="lineNum">      65</span>              :       // _GLIBCXX_RESOLVE_LIB_DEFECTS</span>
<span id="L66"><span class="lineNum">      66</span>              :       // 3188. istreambuf_iterator::pointer should not be unspecified</span>
<span id="L67"><span class="lineNum">      67</span>              :       using pointer = void;</span>
<span id="L68"><span class="lineNum">      68</span>              : #endif</span>
<span id="L69"><span class="lineNum">      69</span>              : </span>
<span id="L70"><span class="lineNum">      70</span>              :       typedef _CharT                                    char_type;</span>
<span id="L71"><span class="lineNum">      71</span>              :       typedef _Traits                                   traits_type;</span>
<span id="L72"><span class="lineNum">      72</span>              :       typedef typename _Traits::int_type                int_type;</span>
<span id="L73"><span class="lineNum">      73</span>              :       typedef basic_streambuf&lt;_CharT, _Traits&gt;            streambuf_type;</span>
<span id="L74"><span class="lineNum">      74</span>              :       typedef basic_istream&lt;_CharT, _Traits&gt;              istream_type;</span>
<span id="L75"><span class="lineNum">      75</span>              :       ///@}</span>
<span id="L76"><span class="lineNum">      76</span>              : </span>
<span id="L77"><span class="lineNum">      77</span>              :       template&lt;typename _CharT2&gt;</span>
<span id="L78"><span class="lineNum">      78</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L79"><span class="lineNum">      79</span>              :                                     ostreambuf_iterator&lt;_CharT2&gt; &gt;::__type</span>
<span id="L80"><span class="lineNum">      80</span>              :         copy(istreambuf_iterator&lt;_CharT2&gt;, istreambuf_iterator&lt;_CharT2&gt;,</span>
<span id="L81"><span class="lineNum">      81</span>              :              ostreambuf_iterator&lt;_CharT2&gt;);</span>
<span id="L82"><span class="lineNum">      82</span>              : </span>
<span id="L83"><span class="lineNum">      83</span>              :       template&lt;bool _IsMove, typename _CharT2&gt;</span>
<span id="L84"><span class="lineNum">      84</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L85"><span class="lineNum">      85</span>              :                                                _CharT2*&gt;::__type</span>
<span id="L86"><span class="lineNum">      86</span>              :         __copy_move_a2(istreambuf_iterator&lt;_CharT2&gt;,</span>
<span id="L87"><span class="lineNum">      87</span>              :                        istreambuf_iterator&lt;_CharT2&gt;, _CharT2*);</span>
<span id="L88"><span class="lineNum">      88</span>              : </span>
<span id="L89"><span class="lineNum">      89</span>              :       template&lt;typename _CharT2, typename _Size&gt;</span>
<span id="L90"><span class="lineNum">      90</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L91"><span class="lineNum">      91</span>              :                                                _CharT2*&gt;::__type</span>
<span id="L92"><span class="lineNum">      92</span>              :         __copy_n_a(istreambuf_iterator&lt;_CharT2&gt;, _Size, _CharT2*, bool);</span>
<span id="L93"><span class="lineNum">      93</span>              : </span>
<span id="L94"><span class="lineNum">      94</span>              :       template&lt;typename _CharT2&gt;</span>
<span id="L95"><span class="lineNum">      95</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L96"><span class="lineNum">      96</span>              :                                     istreambuf_iterator&lt;_CharT2&gt; &gt;::__type</span>
<span id="L97"><span class="lineNum">      97</span>              :         find(istreambuf_iterator&lt;_CharT2&gt;, istreambuf_iterator&lt;_CharT2&gt;,</span>
<span id="L98"><span class="lineNum">      98</span>              :              const _CharT2&amp;);</span>
<span id="L99"><span class="lineNum">      99</span>              : </span>
<span id="L100"><span class="lineNum">     100</span>              :       template&lt;typename _CharT2, typename _Distance&gt;</span>
<span id="L101"><span class="lineNum">     101</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L102"><span class="lineNum">     102</span>              :                                                void&gt;::__type</span>
<span id="L103"><span class="lineNum">     103</span>              :         advance(istreambuf_iterator&lt;_CharT2&gt;&amp;, _Distance);</span>
<span id="L104"><span class="lineNum">     104</span>              : </span>
<span id="L105"><span class="lineNum">     105</span>              :     private:</span>
<span id="L106"><span class="lineNum">     106</span>              :       // 24.5.3 istreambuf_iterator</span>
<span id="L107"><span class="lineNum">     107</span>              :       // p 1</span>
<span id="L108"><span class="lineNum">     108</span>              :       // If the end of stream is reached (streambuf_type::sgetc()</span>
<span id="L109"><span class="lineNum">     109</span>              :       // returns traits_type::eof()), the iterator becomes equal to</span>
<span id="L110"><span class="lineNum">     110</span>              :       // the &quot;end of stream&quot; iterator value.</span>
<span id="L111"><span class="lineNum">     111</span>              :       // NB: This implementation assumes the &quot;end of stream&quot; value</span>
<span id="L112"><span class="lineNum">     112</span>              :       // is EOF, or -1.</span>
<span id="L113"><span class="lineNum">     113</span>              :       mutable streambuf_type*   _M_sbuf;</span>
<span id="L114"><span class="lineNum">     114</span>              :       int_type                  _M_c;</span>
<span id="L115"><span class="lineNum">     115</span>              : </span>
<span id="L116"><span class="lineNum">     116</span>              :     public:</span>
<span id="L117"><span class="lineNum">     117</span>              :       ///  Construct end of input stream iterator.</span>
<span id="L118"><span class="lineNum">     118</span> <span class="tlaGNC tlaBgGNC">           2 :       _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT</span></span>
<span id="L119"><span class="lineNum">     119</span> <span class="tlaGNC">           2 :       : _M_sbuf(0), _M_c(traits_type::eof()) { }</span></span>
<span id="L120"><span class="lineNum">     120</span>              : </span>
<span id="L121"><span class="lineNum">     121</span>              : #if __cplusplus &gt; 201703L &amp;&amp; __cpp_lib_concepts</span>
<span id="L122"><span class="lineNum">     122</span>              :       constexpr istreambuf_iterator(default_sentinel_t) noexcept</span>
<span id="L123"><span class="lineNum">     123</span>              :       : istreambuf_iterator() { }</span>
<span id="L124"><span class="lineNum">     124</span>              : #endif</span>
<span id="L125"><span class="lineNum">     125</span>              : </span>
<span id="L126"><span class="lineNum">     126</span>              : #if __cplusplus &gt;= 201103L</span>
<span id="L127"><span class="lineNum">     127</span>              :       istreambuf_iterator(const istreambuf_iterator&amp;) noexcept = default;</span>
<span id="L128"><span class="lineNum">     128</span>              : </span>
<span id="L129"><span class="lineNum">     129</span>              :       ~istreambuf_iterator() = default;</span>
<span id="L130"><span class="lineNum">     130</span>              : #endif</span>
<span id="L131"><span class="lineNum">     131</span>              : </span>
<span id="L132"><span class="lineNum">     132</span>              :       ///  Construct start of input stream iterator.</span>
<span id="L133"><span class="lineNum">     133</span> <span class="tlaGNC">           2 :       istreambuf_iterator(istream_type&amp; __s) _GLIBCXX_USE_NOEXCEPT</span></span>
<span id="L134"><span class="lineNum">     134</span> <span class="tlaGNC">           2 :       : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }</span></span>
<span id="L135"><span class="lineNum">     135</span>              : </span>
<span id="L136"><span class="lineNum">     136</span>              :       ///  Construct start of streambuf iterator.</span>
<span id="L137"><span class="lineNum">     137</span>              :       istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT</span>
<span id="L138"><span class="lineNum">     138</span>              :       : _M_sbuf(__s), _M_c(traits_type::eof()) { }</span>
<span id="L139"><span class="lineNum">     139</span>              : </span>
<span id="L140"><span class="lineNum">     140</span>              : #if __cplusplus &gt;= 201103L</span>
<span id="L141"><span class="lineNum">     141</span>              :       istreambuf_iterator&amp;</span>
<span id="L142"><span class="lineNum">     142</span>              :       operator=(const istreambuf_iterator&amp;) noexcept = default;</span>
<span id="L143"><span class="lineNum">     143</span>              : #endif</span>
<span id="L144"><span class="lineNum">     144</span>              : </span>
<span id="L145"><span class="lineNum">     145</span>              :       ///  Return the current character pointed to by iterator.  This returns</span>
<span id="L146"><span class="lineNum">     146</span>              :       ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of</span>
<span id="L147"><span class="lineNum">     147</span>              :       ///  operator*() on an end of stream is undefined.</span>
<span id="L148"><span class="lineNum">     148</span>              :       _GLIBCXX_NODISCARD</span>
<span id="L149"><span class="lineNum">     149</span>              :       char_type</span>
<span id="L150"><span class="lineNum">     150</span> <span class="tlaGNC">        2965 :       operator*() const</span></span>
<span id="L151"><span class="lineNum">     151</span>              :       {</span>
<span id="L152"><span class="lineNum">     152</span> <span class="tlaGNC">        2965 :         int_type __c = _M_get();</span></span>
<span id="L153"><span class="lineNum">     153</span>              : </span>
<span id="L154"><span class="lineNum">     154</span>              : #ifdef _GLIBCXX_DEBUG_PEDANTIC</span>
<span id="L155"><span class="lineNum">     155</span>              :         // Dereferencing a past-the-end istreambuf_iterator is a</span>
<span id="L156"><span class="lineNum">     156</span>              :         // libstdc++ extension</span>
<span id="L157"><span class="lineNum">     157</span>              :         __glibcxx_requires_cond(!_S_is_eof(__c),</span>
<span id="L158"><span class="lineNum">     158</span>              :                                 _M_message(__gnu_debug::__msg_deref_istreambuf)</span>
<span id="L159"><span class="lineNum">     159</span>              :                                 ._M_iterator(*this));</span>
<span id="L160"><span class="lineNum">     160</span>              : #endif</span>
<span id="L161"><span class="lineNum">     161</span> <span class="tlaGNC">        5930 :         return traits_type::to_char_type(__c);</span></span>
<span id="L162"><span class="lineNum">     162</span>              :       }</span>
<span id="L163"><span class="lineNum">     163</span>              : </span>
<span id="L164"><span class="lineNum">     164</span>              :       /// Advance the iterator.  Calls streambuf.sbumpc().</span>
<span id="L165"><span class="lineNum">     165</span>              :       istreambuf_iterator&amp;</span>
<span id="L166"><span class="lineNum">     166</span> <span class="tlaGNC">        2965 :       operator++()</span></span>
<span id="L167"><span class="lineNum">     167</span>              :       {</span>
<span id="L168"><span class="lineNum">     168</span>              :         __glibcxx_requires_cond(_M_sbuf &amp;&amp;</span>
<span id="L169"><span class="lineNum">     169</span>              :                                 (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf-&gt;sgetc())),</span>
<span id="L170"><span class="lineNum">     170</span>              :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L171"><span class="lineNum">     171</span>              :                                 ._M_iterator(*this));</span>
<span id="L172"><span class="lineNum">     172</span>              : </span>
<span id="L173"><span class="lineNum">     173</span> <span class="tlaGNC">        2965 :         _M_sbuf-&gt;sbumpc();</span></span>
<span id="L174"><span class="lineNum">     174</span> <span class="tlaGNC">        2965 :         _M_c = traits_type::eof();</span></span>
<span id="L175"><span class="lineNum">     175</span> <span class="tlaGNC">        2965 :         return *this;</span></span>
<span id="L176"><span class="lineNum">     176</span>              :       }</span>
<span id="L177"><span class="lineNum">     177</span>              : </span>
<span id="L178"><span class="lineNum">     178</span>              :       /// Advance the iterator.  Calls streambuf.sbumpc().</span>
<span id="L179"><span class="lineNum">     179</span>              :       istreambuf_iterator</span>
<span id="L180"><span class="lineNum">     180</span>              :       operator++(int)</span>
<span id="L181"><span class="lineNum">     181</span>              :       {</span>
<span id="L182"><span class="lineNum">     182</span>              :         __glibcxx_requires_cond(_M_sbuf &amp;&amp;</span>
<span id="L183"><span class="lineNum">     183</span>              :                                 (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf-&gt;sgetc())),</span>
<span id="L184"><span class="lineNum">     184</span>              :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L185"><span class="lineNum">     185</span>              :                                 ._M_iterator(*this));</span>
<span id="L186"><span class="lineNum">     186</span>              : </span>
<span id="L187"><span class="lineNum">     187</span>              :         istreambuf_iterator __old = *this;</span>
<span id="L188"><span class="lineNum">     188</span>              :         __old._M_c = _M_sbuf-&gt;sbumpc();</span>
<span id="L189"><span class="lineNum">     189</span>              :         _M_c = traits_type::eof();</span>
<span id="L190"><span class="lineNum">     190</span>              :         return __old;</span>
<span id="L191"><span class="lineNum">     191</span>              :       }</span>
<span id="L192"><span class="lineNum">     192</span>              : </span>
<span id="L193"><span class="lineNum">     193</span>              :       // _GLIBCXX_RESOLVE_LIB_DEFECTS</span>
<span id="L194"><span class="lineNum">     194</span>              :       // 110 istreambuf_iterator::equal not const</span>
<span id="L195"><span class="lineNum">     195</span>              :       // NB: there is also number 111 (NAD) relevant to this function.</span>
<span id="L196"><span class="lineNum">     196</span>              :       /// Return true both iterators are end or both are not end.</span>
<span id="L197"><span class="lineNum">     197</span>              :       _GLIBCXX_NODISCARD</span>
<span id="L198"><span class="lineNum">     198</span>              :       bool</span>
<span id="L199"><span class="lineNum">     199</span> <span class="tlaGNC">        2969 :       equal(const istreambuf_iterator&amp; __b) const</span></span>
<span id="L200"><span class="lineNum">     200</span> <span class="tlaGNC">        2969 :       { return _M_at_eof() == __b._M_at_eof(); }</span></span>
<span id="L201"><span class="lineNum">     201</span>              : </span>
<span id="L202"><span class="lineNum">     202</span>              :     private:</span>
<span id="L203"><span class="lineNum">     203</span>              :       int_type</span>
<span id="L204"><span class="lineNum">     204</span> <span class="tlaGNC">        8903 :       _M_get() const</span></span>
<span id="L205"><span class="lineNum">     205</span>              :       {</span>
<span id="L206"><span class="lineNum">     206</span> <span class="tlaGNC">        8903 :         int_type __ret = _M_c;</span></span>
<span id="L207"><span class="lineNum">     207</span> <span class="tlaGNC">        8903 :         if (_M_sbuf &amp;&amp; _S_is_eof(__ret) &amp;&amp; _S_is_eof(__ret = _M_sbuf-&gt;sgetc()))</span></span>
<span id="L208"><span class="lineNum">     208</span> <span class="tlaGNC">           2 :           _M_sbuf = 0;</span></span>
<span id="L209"><span class="lineNum">     209</span> <span class="tlaGNC">        8903 :         return __ret;</span></span>
<span id="L210"><span class="lineNum">     210</span>              :       }</span>
<span id="L211"><span class="lineNum">     211</span>              : </span>
<span id="L212"><span class="lineNum">     212</span>              :       bool</span>
<span id="L213"><span class="lineNum">     213</span> <span class="tlaGNC">        5938 :       _M_at_eof() const</span></span>
<span id="L214"><span class="lineNum">     214</span> <span class="tlaGNC">        5938 :       { return _S_is_eof(_M_get()); }</span></span>
<span id="L215"><span class="lineNum">     215</span>              : </span>
<span id="L216"><span class="lineNum">     216</span>              :       static bool</span>
<span id="L217"><span class="lineNum">     217</span> <span class="tlaGNC">       17806 :       _S_is_eof(int_type __c)</span></span>
<span id="L218"><span class="lineNum">     218</span>              :       {</span>
<span id="L219"><span class="lineNum">     219</span> <span class="tlaGNC">       17806 :         const int_type __eof = traits_type::eof();</span></span>
<span id="L220"><span class="lineNum">     220</span> <span class="tlaGNC">       17806 :         return traits_type::eq_int_type(__c, __eof);</span></span>
<span id="L221"><span class="lineNum">     221</span>              :       }</span>
<span id="L222"><span class="lineNum">     222</span>              : </span>
<span id="L223"><span class="lineNum">     223</span>              : #if __cplusplus &gt; 201703L &amp;&amp; __cpp_lib_concepts</span>
<span id="L224"><span class="lineNum">     224</span>              :       [[nodiscard]]</span>
<span id="L225"><span class="lineNum">     225</span>              :       friend bool</span>
<span id="L226"><span class="lineNum">     226</span>              :       operator==(const istreambuf_iterator&amp; __i, default_sentinel_t)</span>
<span id="L227"><span class="lineNum">     227</span>              :       { return __i._M_at_eof(); }</span>
<span id="L228"><span class="lineNum">     228</span>              : #endif</span>
<span id="L229"><span class="lineNum">     229</span>              :     };</span>
<span id="L230"><span class="lineNum">     230</span>              : </span>
<span id="L231"><span class="lineNum">     231</span>              :   template&lt;typename _CharT, typename _Traits&gt;</span>
<span id="L232"><span class="lineNum">     232</span>              :     _GLIBCXX_NODISCARD</span>
<span id="L233"><span class="lineNum">     233</span>              :     inline bool</span>
<span id="L234"><span class="lineNum">     234</span>              :     operator==(const istreambuf_iterator&lt;_CharT, _Traits&gt;&amp; __a,</span>
<span id="L235"><span class="lineNum">     235</span>              :                const istreambuf_iterator&lt;_CharT, _Traits&gt;&amp; __b)</span>
<span id="L236"><span class="lineNum">     236</span>              :     { return __a.equal(__b); }</span>
<span id="L237"><span class="lineNum">     237</span>              : </span>
<span id="L238"><span class="lineNum">     238</span>              : #if __cpp_impl_three_way_comparison &lt; 201907L</span>
<span id="L239"><span class="lineNum">     239</span>              :   template&lt;typename _CharT, typename _Traits&gt;</span>
<span id="L240"><span class="lineNum">     240</span>              :     _GLIBCXX_NODISCARD</span>
<span id="L241"><span class="lineNum">     241</span>              :     inline bool</span>
<span id="L242"><span class="lineNum">     242</span> <span class="tlaGNC">        2969 :     operator!=(const istreambuf_iterator&lt;_CharT, _Traits&gt;&amp; __a,</span></span>
<span id="L243"><span class="lineNum">     243</span>              :                const istreambuf_iterator&lt;_CharT, _Traits&gt;&amp; __b)</span>
<span id="L244"><span class="lineNum">     244</span> <span class="tlaGNC">        2969 :     { return !__a.equal(__b); }</span></span>
<span id="L245"><span class="lineNum">     245</span>              : #endif</span>
<span id="L246"><span class="lineNum">     246</span>              : </span>
<span id="L247"><span class="lineNum">     247</span>              :   /// Provides output iterator semantics for streambufs.</span>
<span id="L248"><span class="lineNum">     248</span>              :   template&lt;typename _CharT, typename _Traits&gt;</span>
<span id="L249"><span class="lineNum">     249</span>              :     class ostreambuf_iterator</span>
<span id="L250"><span class="lineNum">     250</span>              :     : public iterator&lt;output_iterator_tag, void, void, void, void&gt;</span>
<span id="L251"><span class="lineNum">     251</span>              :     {</span>
<span id="L252"><span class="lineNum">     252</span>              :     public:</span>
<span id="L253"><span class="lineNum">     253</span>              :       // Types:</span>
<span id="L254"><span class="lineNum">     254</span>              :       ///@{</span>
<span id="L255"><span class="lineNum">     255</span>              :       /// Public typedefs</span>
<span id="L256"><span class="lineNum">     256</span>              : #if __cplusplus &gt; 201703L</span>
<span id="L257"><span class="lineNum">     257</span>              :       using difference_type = ptrdiff_t;</span>
<span id="L258"><span class="lineNum">     258</span>              : #endif</span>
<span id="L259"><span class="lineNum">     259</span>              :       typedef _CharT                           char_type;</span>
<span id="L260"><span class="lineNum">     260</span>              :       typedef _Traits                          traits_type;</span>
<span id="L261"><span class="lineNum">     261</span>              :       typedef basic_streambuf&lt;_CharT, _Traits&gt; streambuf_type;</span>
<span id="L262"><span class="lineNum">     262</span>              :       typedef basic_ostream&lt;_CharT, _Traits&gt;   ostream_type;</span>
<span id="L263"><span class="lineNum">     263</span>              :       ///@}</span>
<span id="L264"><span class="lineNum">     264</span>              : </span>
<span id="L265"><span class="lineNum">     265</span>              :       template&lt;typename _CharT2&gt;</span>
<span id="L266"><span class="lineNum">     266</span>              :         friend typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT2&gt;::__value,</span>
<span id="L267"><span class="lineNum">     267</span>              :                                     ostreambuf_iterator&lt;_CharT2&gt; &gt;::__type</span>
<span id="L268"><span class="lineNum">     268</span>              :         copy(istreambuf_iterator&lt;_CharT2&gt;, istreambuf_iterator&lt;_CharT2&gt;,</span>
<span id="L269"><span class="lineNum">     269</span>              :              ostreambuf_iterator&lt;_CharT2&gt;);</span>
<span id="L270"><span class="lineNum">     270</span>              : </span>
<span id="L271"><span class="lineNum">     271</span>              :     private:</span>
<span id="L272"><span class="lineNum">     272</span>              :       streambuf_type*   _M_sbuf;</span>
<span id="L273"><span class="lineNum">     273</span>              :       bool              _M_failed;</span>
<span id="L274"><span class="lineNum">     274</span>              : </span>
<span id="L275"><span class="lineNum">     275</span>              :     public:</span>
<span id="L276"><span class="lineNum">     276</span>              : </span>
<span id="L277"><span class="lineNum">     277</span>              : #if __cplusplus &gt; 201703L</span>
<span id="L278"><span class="lineNum">     278</span>              :       constexpr</span>
<span id="L279"><span class="lineNum">     279</span>              :       ostreambuf_iterator() noexcept</span>
<span id="L280"><span class="lineNum">     280</span>              :       : _M_sbuf(nullptr), _M_failed(true) { }</span>
<span id="L281"><span class="lineNum">     281</span>              : #endif</span>
<span id="L282"><span class="lineNum">     282</span>              : </span>
<span id="L283"><span class="lineNum">     283</span>              :       ///  Construct output iterator from ostream.</span>
<span id="L284"><span class="lineNum">     284</span>              :       ostreambuf_iterator(ostream_type&amp; __s) _GLIBCXX_USE_NOEXCEPT</span>
<span id="L285"><span class="lineNum">     285</span>              :       : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }</span>
<span id="L286"><span class="lineNum">     286</span>              : </span>
<span id="L287"><span class="lineNum">     287</span>              :       ///  Construct output iterator from streambuf.</span>
<span id="L288"><span class="lineNum">     288</span>              :       ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT</span>
<span id="L289"><span class="lineNum">     289</span>              :       : _M_sbuf(__s), _M_failed(!_M_sbuf) { }</span>
<span id="L290"><span class="lineNum">     290</span>              : </span>
<span id="L291"><span class="lineNum">     291</span>              :       ///  Write character to streambuf.  Calls streambuf.sputc().</span>
<span id="L292"><span class="lineNum">     292</span>              :       ostreambuf_iterator&amp;</span>
<span id="L293"><span class="lineNum">     293</span>              :       operator=(_CharT __c)</span>
<span id="L294"><span class="lineNum">     294</span>              :       {</span>
<span id="L295"><span class="lineNum">     295</span>              :         if (!_M_failed &amp;&amp;</span>
<span id="L296"><span class="lineNum">     296</span>              :             _Traits::eq_int_type(_M_sbuf-&gt;sputc(__c), _Traits::eof()))</span>
<span id="L297"><span class="lineNum">     297</span>              :           _M_failed = true;</span>
<span id="L298"><span class="lineNum">     298</span>              :         return *this;</span>
<span id="L299"><span class="lineNum">     299</span>              :       }</span>
<span id="L300"><span class="lineNum">     300</span>              : </span>
<span id="L301"><span class="lineNum">     301</span>              :       /// Return *this.</span>
<span id="L302"><span class="lineNum">     302</span>              :       _GLIBCXX_NODISCARD</span>
<span id="L303"><span class="lineNum">     303</span>              :       ostreambuf_iterator&amp;</span>
<span id="L304"><span class="lineNum">     304</span>              :       operator*()</span>
<span id="L305"><span class="lineNum">     305</span>              :       { return *this; }</span>
<span id="L306"><span class="lineNum">     306</span>              : </span>
<span id="L307"><span class="lineNum">     307</span>              :       /// Return *this.</span>
<span id="L308"><span class="lineNum">     308</span>              :       ostreambuf_iterator&amp;</span>
<span id="L309"><span class="lineNum">     309</span>              :       operator++(int)</span>
<span id="L310"><span class="lineNum">     310</span>              :       { return *this; }</span>
<span id="L311"><span class="lineNum">     311</span>              : </span>
<span id="L312"><span class="lineNum">     312</span>              :       /// Return *this.</span>
<span id="L313"><span class="lineNum">     313</span>              :       ostreambuf_iterator&amp;</span>
<span id="L314"><span class="lineNum">     314</span>              :       operator++()</span>
<span id="L315"><span class="lineNum">     315</span>              :       { return *this; }</span>
<span id="L316"><span class="lineNum">     316</span>              : </span>
<span id="L317"><span class="lineNum">     317</span>              :       /// Return true if previous operator=() failed.</span>
<span id="L318"><span class="lineNum">     318</span>              :       _GLIBCXX_NODISCARD</span>
<span id="L319"><span class="lineNum">     319</span>              :       bool</span>
<span id="L320"><span class="lineNum">     320</span>              :       failed() const _GLIBCXX_USE_NOEXCEPT</span>
<span id="L321"><span class="lineNum">     321</span>              :       { return _M_failed; }</span>
<span id="L322"><span class="lineNum">     322</span>              : </span>
<span id="L323"><span class="lineNum">     323</span>              :       ostreambuf_iterator&amp;</span>
<span id="L324"><span class="lineNum">     324</span>              :       _M_put(const _CharT* __ws, streamsize __len)</span>
<span id="L325"><span class="lineNum">     325</span>              :       {</span>
<span id="L326"><span class="lineNum">     326</span>              :         if (__builtin_expect(!_M_failed, true)</span>
<span id="L327"><span class="lineNum">     327</span>              :             &amp;&amp; __builtin_expect(this-&gt;_M_sbuf-&gt;sputn(__ws, __len) != __len,</span>
<span id="L328"><span class="lineNum">     328</span>              :                                 false))</span>
<span id="L329"><span class="lineNum">     329</span>              :           _M_failed = true;</span>
<span id="L330"><span class="lineNum">     330</span>              :         return *this;</span>
<span id="L331"><span class="lineNum">     331</span>              :       }</span>
<span id="L332"><span class="lineNum">     332</span>              :     };</span>
<span id="L333"><span class="lineNum">     333</span>              : #pragma GCC diagnostic pop</span>
<span id="L334"><span class="lineNum">     334</span>              : </span>
<span id="L335"><span class="lineNum">     335</span>              :   // Overloads for streambuf iterators.</span>
<span id="L336"><span class="lineNum">     336</span>              :   template&lt;typename _CharT&gt;</span>
<span id="L337"><span class="lineNum">     337</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L338"><span class="lineNum">     338</span>              :                                     ostreambuf_iterator&lt;_CharT&gt; &gt;::__type</span>
<span id="L339"><span class="lineNum">     339</span>              :     copy(istreambuf_iterator&lt;_CharT&gt; __first,</span>
<span id="L340"><span class="lineNum">     340</span>              :          istreambuf_iterator&lt;_CharT&gt; __last,</span>
<span id="L341"><span class="lineNum">     341</span>              :          ostreambuf_iterator&lt;_CharT&gt; __result)</span>
<span id="L342"><span class="lineNum">     342</span>              :     {</span>
<span id="L343"><span class="lineNum">     343</span>              :       if (__first._M_sbuf &amp;&amp; !__last._M_sbuf &amp;&amp; !__result._M_failed)</span>
<span id="L344"><span class="lineNum">     344</span>              :         {</span>
<span id="L345"><span class="lineNum">     345</span>              :           bool __ineof;</span>
<span id="L346"><span class="lineNum">     346</span>              :           __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);</span>
<span id="L347"><span class="lineNum">     347</span>              :           if (!__ineof)</span>
<span id="L348"><span class="lineNum">     348</span>              :             __result._M_failed = true;</span>
<span id="L349"><span class="lineNum">     349</span>              :         }</span>
<span id="L350"><span class="lineNum">     350</span>              :       return __result;</span>
<span id="L351"><span class="lineNum">     351</span>              :     }</span>
<span id="L352"><span class="lineNum">     352</span>              : </span>
<span id="L353"><span class="lineNum">     353</span>              :   template&lt;bool _IsMove, typename _CharT&gt;</span>
<span id="L354"><span class="lineNum">     354</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L355"><span class="lineNum">     355</span>              :                                     ostreambuf_iterator&lt;_CharT&gt; &gt;::__type</span>
<span id="L356"><span class="lineNum">     356</span>              :     __copy_move_a2(_CharT* __first, _CharT* __last,</span>
<span id="L357"><span class="lineNum">     357</span>              :                    ostreambuf_iterator&lt;_CharT&gt; __result)</span>
<span id="L358"><span class="lineNum">     358</span>              :     {</span>
<span id="L359"><span class="lineNum">     359</span>              :       const streamsize __num = __last - __first;</span>
<span id="L360"><span class="lineNum">     360</span>              :       if (__num &gt; 0)</span>
<span id="L361"><span class="lineNum">     361</span>              :         __result._M_put(__first, __num);</span>
<span id="L362"><span class="lineNum">     362</span>              :       return __result;</span>
<span id="L363"><span class="lineNum">     363</span>              :     }</span>
<span id="L364"><span class="lineNum">     364</span>              : </span>
<span id="L365"><span class="lineNum">     365</span>              :   template&lt;bool _IsMove, typename _CharT&gt;</span>
<span id="L366"><span class="lineNum">     366</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L367"><span class="lineNum">     367</span>              :                                     ostreambuf_iterator&lt;_CharT&gt; &gt;::__type</span>
<span id="L368"><span class="lineNum">     368</span>              :     __copy_move_a2(const _CharT* __first, const _CharT* __last,</span>
<span id="L369"><span class="lineNum">     369</span>              :                    ostreambuf_iterator&lt;_CharT&gt; __result)</span>
<span id="L370"><span class="lineNum">     370</span>              :     {</span>
<span id="L371"><span class="lineNum">     371</span>              :       const streamsize __num = __last - __first;</span>
<span id="L372"><span class="lineNum">     372</span>              :       if (__num &gt; 0)</span>
<span id="L373"><span class="lineNum">     373</span>              :         __result._M_put(__first, __num);</span>
<span id="L374"><span class="lineNum">     374</span>              :       return __result;</span>
<span id="L375"><span class="lineNum">     375</span>              :     }</span>
<span id="L376"><span class="lineNum">     376</span>              : </span>
<span id="L377"><span class="lineNum">     377</span>              :   template&lt;bool _IsMove, typename _CharT&gt;</span>
<span id="L378"><span class="lineNum">     378</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L379"><span class="lineNum">     379</span>              :                                     _CharT*&gt;::__type</span>
<span id="L380"><span class="lineNum">     380</span>              :     __copy_move_a2(istreambuf_iterator&lt;_CharT&gt; __first,</span>
<span id="L381"><span class="lineNum">     381</span>              :                    istreambuf_iterator&lt;_CharT&gt; __last, _CharT* __result)</span>
<span id="L382"><span class="lineNum">     382</span>              :     {</span>
<span id="L383"><span class="lineNum">     383</span>              :       typedef istreambuf_iterator&lt;_CharT&gt;            __is_iterator_type;</span>
<span id="L384"><span class="lineNum">     384</span>              :       typedef typename __is_iterator_type::traits_type     traits_type;</span>
<span id="L385"><span class="lineNum">     385</span>              :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;</span>
<span id="L386"><span class="lineNum">     386</span>              :       typedef typename traits_type::int_type               int_type;</span>
<span id="L387"><span class="lineNum">     387</span>              : </span>
<span id="L388"><span class="lineNum">     388</span>              :       if (__first._M_sbuf &amp;&amp; !__last._M_sbuf)</span>
<span id="L389"><span class="lineNum">     389</span>              :         {</span>
<span id="L390"><span class="lineNum">     390</span>              :           streambuf_type* __sb = __first._M_sbuf;</span>
<span id="L391"><span class="lineNum">     391</span>              :           int_type __c = __sb-&gt;sgetc();</span>
<span id="L392"><span class="lineNum">     392</span>              :           while (!traits_type::eq_int_type(__c, traits_type::eof()))</span>
<span id="L393"><span class="lineNum">     393</span>              :             {</span>
<span id="L394"><span class="lineNum">     394</span>              :               const streamsize __n = __sb-&gt;egptr() - __sb-&gt;gptr();</span>
<span id="L395"><span class="lineNum">     395</span>              :               if (__n &gt; 1)</span>
<span id="L396"><span class="lineNum">     396</span>              :                 {</span>
<span id="L397"><span class="lineNum">     397</span>              :                   traits_type::copy(__result, __sb-&gt;gptr(), __n);</span>
<span id="L398"><span class="lineNum">     398</span>              :                   __sb-&gt;__safe_gbump(__n);</span>
<span id="L399"><span class="lineNum">     399</span>              :                   __result += __n;</span>
<span id="L400"><span class="lineNum">     400</span>              :                   __c = __sb-&gt;underflow();</span>
<span id="L401"><span class="lineNum">     401</span>              :                 }</span>
<span id="L402"><span class="lineNum">     402</span>              :               else</span>
<span id="L403"><span class="lineNum">     403</span>              :                 {</span>
<span id="L404"><span class="lineNum">     404</span>              :                   *__result++ = traits_type::to_char_type(__c);</span>
<span id="L405"><span class="lineNum">     405</span>              :                   __c = __sb-&gt;snextc();</span>
<span id="L406"><span class="lineNum">     406</span>              :                 }</span>
<span id="L407"><span class="lineNum">     407</span>              :             }</span>
<span id="L408"><span class="lineNum">     408</span>              :         }</span>
<span id="L409"><span class="lineNum">     409</span>              :       return __result;</span>
<span id="L410"><span class="lineNum">     410</span>              :     }</span>
<span id="L411"><span class="lineNum">     411</span>              : </span>
<span id="L412"><span class="lineNum">     412</span>              :   template&lt;typename _CharT, typename _Size&gt;</span>
<span id="L413"><span class="lineNum">     413</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L414"><span class="lineNum">     414</span>              :                                     _CharT*&gt;::__type</span>
<span id="L415"><span class="lineNum">     415</span>              :     __copy_n_a(istreambuf_iterator&lt;_CharT&gt; __it, _Size __n, _CharT* __result,</span>
<span id="L416"><span class="lineNum">     416</span>              :                bool __strict __attribute__((__unused__)))</span>
<span id="L417"><span class="lineNum">     417</span>              :     {</span>
<span id="L418"><span class="lineNum">     418</span>              :       if (__n == 0)</span>
<span id="L419"><span class="lineNum">     419</span>              :         return __result;</span>
<span id="L420"><span class="lineNum">     420</span>              : </span>
<span id="L421"><span class="lineNum">     421</span>              :       __glibcxx_requires_cond(__it._M_sbuf,</span>
<span id="L422"><span class="lineNum">     422</span>              :                               _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L423"><span class="lineNum">     423</span>              :                               ._M_iterator(__it));</span>
<span id="L424"><span class="lineNum">     424</span>              :       _CharT* __beg = __result;</span>
<span id="L425"><span class="lineNum">     425</span>              :       __result += __it._M_sbuf-&gt;sgetn(__beg, __n);</span>
<span id="L426"><span class="lineNum">     426</span>              :       __glibcxx_requires_cond(!__strict || __result - __beg == __n,</span>
<span id="L427"><span class="lineNum">     427</span>              :                               _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L428"><span class="lineNum">     428</span>              :                               ._M_iterator(__it));</span>
<span id="L429"><span class="lineNum">     429</span>              :       return __result;</span>
<span id="L430"><span class="lineNum">     430</span>              :     }</span>
<span id="L431"><span class="lineNum">     431</span>              : </span>
<span id="L432"><span class="lineNum">     432</span>              :   template&lt;typename _CharT&gt;</span>
<span id="L433"><span class="lineNum">     433</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L434"><span class="lineNum">     434</span>              :                                     istreambuf_iterator&lt;_CharT&gt; &gt;::__type</span>
<span id="L435"><span class="lineNum">     435</span>              :     find(istreambuf_iterator&lt;_CharT&gt; __first,</span>
<span id="L436"><span class="lineNum">     436</span>              :          istreambuf_iterator&lt;_CharT&gt; __last, const _CharT&amp; __val)</span>
<span id="L437"><span class="lineNum">     437</span>              :     {</span>
<span id="L438"><span class="lineNum">     438</span>              :       typedef istreambuf_iterator&lt;_CharT&gt;            __is_iterator_type;</span>
<span id="L439"><span class="lineNum">     439</span>              :       typedef typename __is_iterator_type::traits_type     traits_type;</span>
<span id="L440"><span class="lineNum">     440</span>              :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;</span>
<span id="L441"><span class="lineNum">     441</span>              :       typedef typename traits_type::int_type               int_type;</span>
<span id="L442"><span class="lineNum">     442</span>              :       const int_type __eof = traits_type::eof();</span>
<span id="L443"><span class="lineNum">     443</span>              : </span>
<span id="L444"><span class="lineNum">     444</span>              :       if (__first._M_sbuf &amp;&amp; !__last._M_sbuf)</span>
<span id="L445"><span class="lineNum">     445</span>              :         {</span>
<span id="L446"><span class="lineNum">     446</span>              :           const int_type __ival = traits_type::to_int_type(__val);</span>
<span id="L447"><span class="lineNum">     447</span>              :           streambuf_type* __sb = __first._M_sbuf;</span>
<span id="L448"><span class="lineNum">     448</span>              :           int_type __c = __sb-&gt;sgetc();</span>
<span id="L449"><span class="lineNum">     449</span>              :           while (!traits_type::eq_int_type(__c, __eof)</span>
<span id="L450"><span class="lineNum">     450</span>              :                  &amp;&amp; !traits_type::eq_int_type(__c, __ival))</span>
<span id="L451"><span class="lineNum">     451</span>              :             {</span>
<span id="L452"><span class="lineNum">     452</span>              :               streamsize __n = __sb-&gt;egptr() - __sb-&gt;gptr();</span>
<span id="L453"><span class="lineNum">     453</span>              :               if (__n &gt; 1)</span>
<span id="L454"><span class="lineNum">     454</span>              :                 {</span>
<span id="L455"><span class="lineNum">     455</span>              :                   const _CharT* __p = traits_type::find(__sb-&gt;gptr(),</span>
<span id="L456"><span class="lineNum">     456</span>              :                                                         __n, __val);</span>
<span id="L457"><span class="lineNum">     457</span>              :                   if (__p)</span>
<span id="L458"><span class="lineNum">     458</span>              :                     __n = __p - __sb-&gt;gptr();</span>
<span id="L459"><span class="lineNum">     459</span>              :                   __sb-&gt;__safe_gbump(__n);</span>
<span id="L460"><span class="lineNum">     460</span>              :                   __c = __sb-&gt;sgetc();</span>
<span id="L461"><span class="lineNum">     461</span>              :                 }</span>
<span id="L462"><span class="lineNum">     462</span>              :               else</span>
<span id="L463"><span class="lineNum">     463</span>              :                 __c = __sb-&gt;snextc();</span>
<span id="L464"><span class="lineNum">     464</span>              :             }</span>
<span id="L465"><span class="lineNum">     465</span>              : </span>
<span id="L466"><span class="lineNum">     466</span>              :           __first._M_c = __eof;</span>
<span id="L467"><span class="lineNum">     467</span>              :         }</span>
<span id="L468"><span class="lineNum">     468</span>              : </span>
<span id="L469"><span class="lineNum">     469</span>              :       return __first;</span>
<span id="L470"><span class="lineNum">     470</span>              :     }</span>
<span id="L471"><span class="lineNum">     471</span>              : </span>
<span id="L472"><span class="lineNum">     472</span>              :   template&lt;typename _CharT, typename _Distance&gt;</span>
<span id="L473"><span class="lineNum">     473</span>              :     typename __gnu_cxx::__enable_if&lt;__is_char&lt;_CharT&gt;::__value,</span>
<span id="L474"><span class="lineNum">     474</span>              :                                     void&gt;::__type</span>
<span id="L475"><span class="lineNum">     475</span>              :     advance(istreambuf_iterator&lt;_CharT&gt;&amp; __i, _Distance __n)</span>
<span id="L476"><span class="lineNum">     476</span>              :     {</span>
<span id="L477"><span class="lineNum">     477</span>              :       if (__n == 0)</span>
<span id="L478"><span class="lineNum">     478</span>              :         return;</span>
<span id="L479"><span class="lineNum">     479</span>              : </span>
<span id="L480"><span class="lineNum">     480</span>              :       __glibcxx_assert(__n &gt; 0);</span>
<span id="L481"><span class="lineNum">     481</span>              :       __glibcxx_requires_cond(!__i._M_at_eof(),</span>
<span id="L482"><span class="lineNum">     482</span>              :                               _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L483"><span class="lineNum">     483</span>              :                               ._M_iterator(__i));</span>
<span id="L484"><span class="lineNum">     484</span>              : </span>
<span id="L485"><span class="lineNum">     485</span>              :       typedef istreambuf_iterator&lt;_CharT&gt;            __is_iterator_type;</span>
<span id="L486"><span class="lineNum">     486</span>              :       typedef typename __is_iterator_type::traits_type     traits_type;</span>
<span id="L487"><span class="lineNum">     487</span>              :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;</span>
<span id="L488"><span class="lineNum">     488</span>              :       typedef typename traits_type::int_type               int_type;</span>
<span id="L489"><span class="lineNum">     489</span>              :       const int_type __eof = traits_type::eof();</span>
<span id="L490"><span class="lineNum">     490</span>              : </span>
<span id="L491"><span class="lineNum">     491</span>              :       streambuf_type* __sb = __i._M_sbuf;</span>
<span id="L492"><span class="lineNum">     492</span>              :       while (__n &gt; 0)</span>
<span id="L493"><span class="lineNum">     493</span>              :         {</span>
<span id="L494"><span class="lineNum">     494</span>              :           streamsize __size = __sb-&gt;egptr() - __sb-&gt;gptr();</span>
<span id="L495"><span class="lineNum">     495</span>              :           if (__size &gt; __n)</span>
<span id="L496"><span class="lineNum">     496</span>              :             {</span>
<span id="L497"><span class="lineNum">     497</span>              :               __sb-&gt;__safe_gbump(__n);</span>
<span id="L498"><span class="lineNum">     498</span>              :               break;</span>
<span id="L499"><span class="lineNum">     499</span>              :             }</span>
<span id="L500"><span class="lineNum">     500</span>              : </span>
<span id="L501"><span class="lineNum">     501</span>              :           __sb-&gt;__safe_gbump(__size);</span>
<span id="L502"><span class="lineNum">     502</span>              :           __n -= __size;</span>
<span id="L503"><span class="lineNum">     503</span>              :           if (traits_type::eq_int_type(__sb-&gt;underflow(), __eof))</span>
<span id="L504"><span class="lineNum">     504</span>              :             {</span>
<span id="L505"><span class="lineNum">     505</span>              :               __glibcxx_requires_cond(__n == 0,</span>
<span id="L506"><span class="lineNum">     506</span>              :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)</span>
<span id="L507"><span class="lineNum">     507</span>              :                                 ._M_iterator(__i));</span>
<span id="L508"><span class="lineNum">     508</span>              :               break;</span>
<span id="L509"><span class="lineNum">     509</span>              :             }</span>
<span id="L510"><span class="lineNum">     510</span>              :         }</span>
<span id="L511"><span class="lineNum">     511</span>              : </span>
<span id="L512"><span class="lineNum">     512</span>              :       __i._M_c = __eof;</span>
<span id="L513"><span class="lineNum">     513</span>              :     }</span>
<span id="L514"><span class="lineNum">     514</span>              : </span>
<span id="L515"><span class="lineNum">     515</span>              : /// @} group iterators</span>
<span id="L516"><span class="lineNum">     516</span>              : </span>
<span id="L517"><span class="lineNum">     517</span>              : _GLIBCXX_END_NAMESPACE_VERSION</span>
<span id="L518"><span class="lineNum">     518</span>              : } // namespace</span>
<span id="L519"><span class="lineNum">     519</span>              : </span>
<span id="L520"><span class="lineNum">     520</span>              : #endif</span>
        </pre>
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